Problem with nextgen gallery (thumnail resize)

Cant get nextgen gallery to work on my site https://www.jonasb.no The probliem is to get resizeing thumnails to work. thumnails under Gallery->manage gallery->allery name. Edit thumb.

I can only see a thumnail on right side on white background and on the other side its just a grey box.

I have tried
Reinstalling nextgen gallery many times
Changing to theme Twenty Eleven 1.2
disable all plugins my renaming the folder
tried different browsers.

I have ha somone suggest that i reupload all .js files. Is it a esey way to do this.
I have had wordpress cleaned for malmware newly.

Any suggestions ?